The ultra-quiet AIRPLATE S7 fan system is designed to cool home theaters, entertainment centers, and audio video cabinets that can be mounted in any direction. Features a CNC machined aluminum frame with a modern brushed black finish. Fans are set to exhaust air out the frame but this can be reversed to intake air using a screw driver. Includes all necessary hardware to easily mount the unit onto a cabinet and power it through an USB port or standard wall outlet. The in-line multi-speed controller with power switch allows setting the fan’s speed to optimal noise and airflow levels for various environments. For cabinets that requires more airflow, each unit can be connected to additional AIRPLATE S and T series cabinet fans. Up to four fans can share the same USB power source; and up to six fans can share the same thermal controller or wall outlet power source. Note: AIRPLATE S7 contains two fans and AIRPLATE S9 contains three fans. All setups with more than four daisy-chained fans must have their inline speed controller set to high to prevent overload, e.g. two AIRPLATE S9 units daisy-chained together.